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<HTML
><HEAD
><TITLE
>Regular expressions</TITLE
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>Regular expressions</A
></H1
><P
> Regular expressions are used for complex string manipulation in
PHP. The functions that support regular expressions are:
<P
></P
><UL
><LI
><P
><A
HREF="function.ereg.html"
><B
CLASS="FUNCTION"
>ereg()</B
></A
>
</P
></LI
><LI
><P
><A
HREF="function.ereg-replace.html"
><B
CLASS="FUNCTION"
>ereg_replace()</B
></A
>
</P
></LI
><LI
><P
><A
HREF="function.eregi.html"
><B
CLASS="FUNCTION"
>eregi()</B
></A
>
</P
></LI
><LI
><P
><A
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><B
CLASS="FUNCTION"
>eregi_replace()</B
></A
>
</P
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><LI
><P
><A
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><B
CLASS="FUNCTION"
>split()</B
></A
>
</P
></LI
></UL
>
These functions all take a regular expression string as their
first argument. PHP uses the POSIX extended regular expressions
as defined by POSIX 1003.2. For a full description of POSIX
regular expressions see the regex man pages included in the regex
directory in the PHP distribution.
</P
><P
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CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="EXAMPLE"
><P
><B
>Example 4-5. Regular expression examples</B
></P
><PRE
CLASS="PROGRAMLISTING"
>ereg("abc",$string);
/* Returns true if "abc"
is found anywhere in $string. */
ereg("^abc",$string);
/* Returns true if "abc"
is found at the beginning of $string. */
ereg("abc$",$string);
/* Returns true if "abc"
is found at the end of $string. */
eregi("(ozilla.[23]|MSIE.3)",$HTTP_USER_AGENT);
/* Returns true if client browser
is Netscape 2, 3 or MSIE 3. */
ereg("([[:alnum:]]+) ([[:alnum:]]+) ([[:alnum:]]+)",
$string,$regs);
/* Places three space separated words
into $regs[1], $regs[2] and $regs[3]. */
ereg_replace("^","<BR>",$string);
/* Put a <BR> tag at the beginning of $string. */
ereg_replace("$","<BR>",$string);
/* Put a <BR> tag at the end of $string. */
ereg_replace("\n","",$string);
/* Get rid of any carriage return
characters in $string. */
</PRE
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